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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283ab996ccb1bba5b40ea61e947ab161b98c82343bbfc80abcc6acd8c7807939' 
  AND token = 'zPEVzShYH+v932sCq6KTU9UdrmujYq55INLvoxXA3lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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