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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d940bce41984fb64063e750d75c3658a4e812751f1d26a96d9b4e2a12ad9b58' 
  AND token = '5AZRMYBkxSqS55/szzkjUaJ6G6/qcuLEE07rFvE4E24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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