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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7c3d3473ea8570289f68848500105a742515d7009e94a3bfc418e53a3b8757' 
  AND token = '7D7IOun7F/gsox13RVQDohZHEtH939D02ezD8at00rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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