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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de820f84e7c0305e83ea22d667873eec46439f53e7c4cd09022c3b36c1fa2a6a' 
  AND token = 'KNVCsiQBwPcljQU6HyYwqu37bESw2MCayEcBt0W/IHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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