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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd2d802c261c248f6037b77880c6d146dcdd55cc76bcada5f3d57a108d32db5' 
  AND token = '1tnB2bTjknBnTSW4aLch+5nGrtdMLZ3cuoIoJ5/EUas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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