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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351747b620b9347f63a66f5862d3e33627bdcc93829e1eaa36236f01fe7c7db1' 
  AND token = 'x+zU2j8N//4qja6Xb58q2SULqppVAWXIVp6CcWU5aeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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