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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d88b1156dce04e90652976bf272890277991563d9e653ad4a3389832a28541' 
  AND token = 'H9rnNFJZD/FiCh9ylussL/QF3dOTnPXiItl44hfFub4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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