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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f278e00a2c3c49b62f605f258e89472db66f4c357aa010856f828eb7253f2e' 
  AND token = '1gGBKYBi/N/VVxiTMddPT1Kep1qw1yk0sE8w1M/7afM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}