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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6897b647257e84b29a938d445c8209f0614592065c25bf195c0f2e8bad39d0d7' 
  AND token = 'l/0grQO/zU6lNqM4rm8uWoniRfyPSk68XDRvHWTIndE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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