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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c484c0e87693da5b6222366b953008aa139f03103000a7a1a6fb8563979b701' 
  AND token = 'sci626e2AftlqyfXT2Q+Tm3kgGLwov0qrAG7bzrPVpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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