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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dae5cf6fcbed8faea85d8d46fd0db6c3f74ca7fa1e67a46b73be3f0834cd3d3' 
  AND token = '9qYxWF20VzU22Eo4gDtS7Dh7tKZHHiwZFiHuChWLfoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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