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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee01382729c4efa040aa045c8decf68b788a177259b5933178ffa6e338a7baf' 
  AND token = 'Mq8JJm9kcgM/yU/u2z9Em2tEOpjPtFeePeEhVgnT6dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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