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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0ecc6362e476c62e5bf1a212b5d42dd1fee30b76ce86840ecc0e9955f7c38b' 
  AND token = 'STY5U0dclSMxLbQL1rs4aTImPYLpH6pQHpitubCuV0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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