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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29aac93c17d927ab76917fd4a34ac2631b5c1e0e4ae172b2b497c34fc0c93d5' 
  AND token = 'lNwYbbe/pXoWudI2jiVD7zR+b7DSg9kYbRIXvZwvwB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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