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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da5ddef9606e9bf51f59571cf54835b03df407c1a708af3806cb5d1cc97e4e0' 
  AND token = '23kkR0rfILcwUxF21IFWuxZoi45VDQbZ2h6ID92/3C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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