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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b541ea369bf77f5d62067fada2a91eb0deb2f87ffa11eeb2f12c4c14b5a16067' 
  AND token = 'RweqwDD/gmd970silX3XVIGUQDQJeEv7lipOvfjWlRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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