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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee46a9015427efd2eaf81e47906589e41cf35acc81e3c23f8457b95cb12809d' 
  AND token = 'h+LRZqMmuD3rh2X8BRkBMOzfkZDs0EUj0dd3MLV6Ekc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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