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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3baec6f6b99ae4f603108769ac3a4d84af178de05acef67c4f83a2ba400b98' 
  AND token = 'qvuEboKyct8AHZsPl8PMm5Rdo8EcOaSo1LwrwrZ10vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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