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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26342c5915d57b2fab730bb749ed12f9212705ad0a6c0c8f1db83b4c1a59a05f' 
  AND token = '7YX1H3lzX6QplvE5Acd18lTM1LRbJKHWocn6FBR1ZDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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