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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dba8fbb80d246c8bdf02a0819b79739975417dc9246cd06965cc36e3ac1664f' 
  AND token = 'NIdbniFYyYatW5tC+Z4EcT65477Ps4hp1JYnLB7DCk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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