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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25d6bc6a170c5f117c7124855fb0303a03007e3e911f5ab800e6a4fe6d47827' 
  AND token = 'VYrQ3i2X0eLcrN40Aoff3+mWm/g5mk011iP1LZhEG98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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