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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2b40573085d6b4e6911634738b8ad18123068f76b3a3eae6beb8d56beaea08' 
  AND token = 'FgQjuL4rBNv2Zq+6KAgCfWwniavxiZb4g3P1ga/6jQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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