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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447f5f748afa8bc262553598ebb095ac73f8c4e2e99a197393f7d75e2ba3b236' 
  AND token = '0xNQQN3GH9rp8qk4FoNJh+bk0uz79j/zIUm+B17rJ+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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