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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69abc1c2cf45f6c93685eb680b37629d8e2ffa1847d5dfd3de9ff9b3fff80ba7' 
  AND token = 'Sf6YC7VXI1JMOdeqBFEThE7D/hrG1GCwerRMurNHOk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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