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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2cde6662b6ca4ae0a7a4ebf5995f4dd22c1f8ff2def136a1549fcf64ffefd74' 
  AND token = 'alzaTvfGkU0gGwqLJWBMN67CxQN50tWq26MVY+NUb5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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