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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d66faf9e8c1ea6e6dcdc13eeffb9db1f9e743e4de38f91eb6796f13fe83fc0a' 
  AND token = 'ty1pUWL0d7JjRWFVCHiX3Y1udS/tDJoIWOuDVgu5qSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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