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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4bb42e20ca9a6cb4fb4e5bff52d85cdfc454b87184f2c461cfdeacf6448b23' 
  AND token = '7hkuqq6VltvLJ2+ElkPKxfgrWw4AZj+88dKQsgQXK5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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