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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d9af417ab0f4cab365b7952e4ba03e21c7668b9d67ca52c7d3928adb77b034' 
  AND token = 'W10ADGimmqOX7yrL+m2nTGs3J4fO0dExa5GBAwad3uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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