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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63feb0aa6d339da4deb33565b58bbcbce6cef3d1ba82cbcd12ff8a4b0c5dfc85' 
  AND token = 'rdpYc6yYP80+Qpy0W6WY6pYtq2tBMC0YiQj6TrqSnC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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