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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca469757dc8373757672c7cf62c73a124e12ccf1c0d537a4691163bd653f64a' 
  AND token = 'YPLNxR8u9yrLBWifHAZNCctOOuuW018etJtsgTxqnsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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