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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8341c40f00b8b2febe165916a9ce89ecda79d4fbb23f6a1d672a9f21d3d0d4fc' 
  AND token = '8oIrBFVz4JwIQyMhUUVobiDn7q2ql7BJPEOWkk8yh00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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