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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d456287b23777bce861ece4f18269217a71de600f964235d44308c8bb5268f' 
  AND token = 'CbBYzjMVUkUqS1kkCz03m+apj8ROps5Xt+bjtzCtVWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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