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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3bfe88a2ecd296e8e805bb100b4230edb6af2b71f2078d78d48a427f3630e9' 
  AND token = 'HpAHQ7rd4qSQk/vn10jQ8ExUtee2274OjByNUa7NnW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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