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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b075a564a528765467fb37b74062e4643bd4f28cbcd67931a6a2e47aa686c1' 
  AND token = 'Cq3nlLZMeFNmbDlAWEspyX/WkFrAbaXI+la/lXkKOR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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