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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc0fa83b9f8da9ca5d38f9fbd82ff58a3b6b1b72410900cb39d73b4adc9c6fe' 
  AND token = '7AKOtPzje5a/KRF16dmKNy4LFImDTT830+f+UX2jRrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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