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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd5f4ffe352d461a6c044dd948e94b66c44ad35a9c61b2bece9104a0648d496' 
  AND token = '7oS72RvS+N7MxNZ1GKX6Io3sw1Jm8hdB3QXJ/Vcmwbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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