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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa498784834788e6fdabf3d12b570926fe0d9d4674c3dc0627d05f07604a092e' 
  AND token = 'vzBevJEykV4GqG5gm+meBK1OTbbX9pPSWBO4A+vQf54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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