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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58637640d699624791c97baf6640c7d7ef52c02bd40cc10c24126b8d8111bf9d' 
  AND token = 'aKuLxjhF3zLdI/LY9nxL/TVDUWncCH6E8rO1r5lkxog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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