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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b6171d6439caeeaea2546bc8966d9d7a9c61f084c9eb5cb022614d7424271e' 
  AND token = 'oJkp48/YiLXAekJMBP9WCLquMCh3+UH7hGu4r+nqbfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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