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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f367b60aba418f1d42e2d1a124bbdc81df6d38c88326e563762234af13ed902' 
  AND token = '7fMVsL0S5kWv8nwPc+JXbTzto6FbRZ3ksSF7qIg1WLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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