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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0914b0dc3330fe28b269a438b46e9dad320f99d6371f109ffa7bb1fc7c0083' 
  AND token = 'SNqy26dMY0ObUOhHikee17decNga70fMqMOKNjuxRZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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