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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d01b0bb6c224b8f396977405629de52a00e01ff1038e436778aaca73c4cfe8a' 
  AND token = 'exNEPO9Dz+IYbDTinBFObU5r5ELlqlLBxgsUlWEyHy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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