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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fe5a3fe9da9c11c412c7fdb6db1c5c6e7ef2c88c5bc4ce57f9197ead8f5bb1' 
  AND token = 'kccwdNq8MWd3sHdzBXB+5bEqK5rCNI+/mtE7kYJEfF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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