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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a97edddf97c662c585d405ed39354b4391831988e7cebf263ad66c54f3d7ce' 
  AND token = 'WoytFnbT2Ttqze6Pb9LiA9Sxon+7eJ1ovDEXqkCI4c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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