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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db320b532f54fe73624c114a85801fe6f8056c055e5ca6881c3ffa2f25b09e88' 
  AND token = 'N1kqhAVzxRYjP/DWa5jSS0N85QJ1h1xRjrpr8G9ws2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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