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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85c177c27dfe0777b7cb29ac6068a6787bcff02d57e57cd6e9322fab2e92130' 
  AND token = 'rp7NlPiltj8OiU10SlFxmdZRh0kkLaKlcC/8rG3T9K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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