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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed68ec249bd1868de60ca1c1884f97a3de8beb27db88545e00f1e9bfa0d73b36' 
  AND token = 'C3bt9aObN8KtdvETgLHm31AilSRmhTnFJ6Lm8cen9CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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