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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b93f68639565132c1a924362bf2e7ca9cd31b7da534dc9708c940e99b5d1ba' 
  AND token = 'nGpCAaAUppWZ8gCq7Krurce167bKsXQC7NahJ4n035w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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