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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8982e559a442352d59574f3f437505b87e25f2d3d8d418bd94601b2ea120e54d' 
  AND token = 'GCX2Tftl4bVlbSEv/MJwqRrMgLvVM3CCxUyvAcMBOf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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