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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f09fb1869ca0e7b7492375ed7002878017a9d23260db3b8c4940b6304004ec' 
  AND token = 'pOesSl/oJqoMt9JXJQ6tCdAiOqMJRrta/hm6tvme/EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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