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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8904f51aaa01593286514404f3c4f2b5ee264ef599c3b42008f1208cd09a04d' 
  AND token = 'g81BxABIehnBy1KbU/VTLam59mEuc7aijCEYMC5CmRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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