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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09708aa1bb94cf00c59fae5c9153dcfe469876a4bc99904db467bcdd77b72071' 
  AND token = 'PjxaAqVI95PEafP/m/DWBou7LVAWInDuJQSg/AMsP3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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