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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75870abfb5381ef6fe884202c833037b498b8733fbef5e66df2443ae3ed06ac' 
  AND token = 'LoTcyePOrdWq7lMcF2xIViuaZ9rXfo3aT9PuP3YhlSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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