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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b538f9009056b95bc48f7f7a4891d8a10372129fe109043abff2290ff817fa' 
  AND token = 'qBUW5YAmje6UkNQUrFrvLNnfkM//AXYh3PQ0vFmO7/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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