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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4077128cd37e1098a386f98f7e66eb67b9eb13c743357058722c7c33f265e98' 
  AND token = 'amlyl9jF2/sskKSYlKFYuNHXwddc6vSo9b4rhIvd/ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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