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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fcd68d43e5868d06e5ca689f6e977ba56fcedec3a804d2314b02f3e73e438a' 
  AND token = '8fNcQrpBX0JV4P1cPUCMB9JoPg4xhGiLYhu4bzSaUhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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