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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93affb91a24b6ecf627003ca8ccb5d8a56290b6f87d1343a88af109dfb4f1b24' 
  AND token = 'ZAlQVawl7vxbneqrCl1EprXUSdCCeGJxsyIteVp3q2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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