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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbba70ea7eda8c9f6d0de9207df950168ffd5b11b0592fa55def73a1e0e64d31' 
  AND token = 'J/tWEj4fkfZ56dWFaQdbTqD1v685G25EWzozqVgNq28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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