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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb62ac0869633e35ce2cb767cc86ed52d8d51bcb9c57b3771492112b7fe48b28' 
  AND token = 'HkTeDJIoJHvM+j3oOiFYxgclZcbw3NHuWFQyOQn/QL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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