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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e793d74f6593d18460aa46d8b6c041d7d00ee3317b43fd663035e32e757c586' 
  AND token = 'Vgf1FWQIG9GTLLHl7mDpPFXIYla54cmUixRUSRGKVg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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