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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd653e9894b93ab3d0968c83f254176fb519ec487dcbb29c6822eb3495a735f' 
  AND token = '755HNWyxxCF76OTRpU5ZpL8Qi6vNH4BiwJHhoJBREzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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