SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a2292c1ba8c6f1ed2e174db6f9edd9253a45c73b454779a503904faea0b6b6' 
  AND token = 'j5Ho1c55RH/pS/roh27LGKDpEBmQ8FOjqMvYOmD9gs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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