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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6953ed8df6e16d6cb1d095576184fbce04191f69f4d576d454be58c0ccb6edd6' 
  AND token = 'lIYpgD/6MKaGzT1gKGhRfVKf84cn842SdzhmX7zX2gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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