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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a744367cbe2a10999c627af35eac20408444cc3a951f19cc1360fec4b1da74' 
  AND token = 'h6tmLvKGg0uiF2AgdD2msgYnLMHeL90z/oyc/aXQ3gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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