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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021206e52cba7a9fdbf5abb2b0de0e79700e6a6744a8273ec155a25c3f2a7665' 
  AND token = 'sEgnfJiGkqJKc1sQa4T6dRgsIWNBPPKE8yjXck43SMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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