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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002d58ff7c6fd6d8a6a0985767812703c3479719b5c7995bde2022e70fe464b7' 
  AND token = 'jLQcRm2ZfRulLjDuGwUC0GBHMBfqrBb+Z8ZDZLfLM6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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